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. >>> face recognition software has been around for several years, but now it is much more than that. law enforcement can use video surveillance to find suspects not only by how they look, but as joe vazquez shows us, how they walk. >> we consider them to be armed and extremely dangerous. >> now that the fbi released photos, how will they find the bombers? >> all the time this individual has appeared. >> joe says sophisticated software, like the kind his company makes, produces video intelligence. the software uses facial recognition to sift through hours and hours of video and hundreds of photos taken on race day and it could reduce the amount of time it takes law enforcement to find even more images of the suspects. >> we're talking from several weeks, several months of investigation time to a matter of days, if not hours. >> analyzed the shape of the nose, the distance between the eyes, the hairline, and compare the photo of the suspect with other surveillance video, perhaps taken later at a train station or an airplane. but video intelligence is more than just facial recognition
and called 911. law enforcement sources say they exchanged gunfire with the suspect. a neighbor caught the fire fight on video. >> ultimately, the hostage rescue team of the fbi made an entry into the boat and removed the suspect of who was still alive in the boat. >> the standoff came 24 hours after dzhokhar and his older brother killed an officer. that led to a fierce fire fight with police in watertown that killed tamerlan and may have injured his brother. it has been a long day for the people here in watertown and in the greater boston area. the search for the brothers closed schools and offices and all but shut down the entire area. president obama expressed his thanks from the white house. >> we owe a tremendous debt of gratitude to all our outstanding law enforcement professionals. >> reporter: the fbi marked his page, captured, and people gathered for a candle light vigil near the finish line of the marathon. in addition to a motive. investigators will be looking to answer if these two brothers were working alone or part of a larger terror group. we can tell you that three
of homeland security warned law enforcement in 2004 and 2010 the terror attacks using pressure cookers and improvised devices. but just because it was used in boston doesn't necessarily point to overseas terrorism. the fact that white smoke and not black smoke came from the blast just it was probably not a more sophisticated device usually associated with foreign terror attacks. >> generally a white or gray smoke will indicate a commercial explosive because traditionally, again for the most part, all of the military explosives are petroleum based, so that oil burning or detonating will create a black oil or dark smoke. >> they haven't ruled out the possibility that if the domestic style or or mobile. directions and equipment for the bomb can easily be found online. >> well, some foreign terrorists are quick to take credit for massive disaster that it was caused. >> and that hasn't happened in this case. the investigation could be a long one. >> you can expect to see extra police officers patrolling the bay area transit. and linda tells us, that's all. >> san francisco police remain on
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